Yep. That is something should teach to touch social idiots who get their kicks by mocking youngters too many times.
Here's few persons that are so above others, they live here, with no other life. They know their stuff, but are so eager to ask "why are you doing this?", like the person asking his/her question should know immediately "oh, I should done it other way". Sometimes I fall in to that too, and feel bad everytime after.
Yes, I teach kids in my real life, in sports. There's no problem for me to try to help them to learn about the thing they are handling, but the correct way to behave with other people as well.
Behave, give the message nicely.
Cheers,
Kari